#include <windows.h>
#include <stdio.h>
/*定义回调函数*/
int add (int a,int b)
{
	return (a+b);
}
int sub (int a,int b)
{
	return (a-b);
}
int mul (int a,int b)
{
	return (a*b);
}
/*定义调用“回调函数”的函数*/
void math(int (*funcptr)(int x ,int y),int s,int t)
{
    
	printf("funcptr(int,int)=%d\n",funcptr(s,t));
}
int main(void)
{  
	int a=22,b=3 ;
    math(add,a,b);
	math(sub,a,b);
	math(mul,a,b);
	system("pause");
	   return 0;
}

/*指针函数*/

/*int * GetDate(int wk,int dy);
int main(void)
    {
       int i=0,j=0;
       for(i=0;i<5;i++) 
	   {
		   for(j=0;j<7;j++)
			   printf("%d\t",*GetDate(i,j));
		   printf("\n");
	   }
       
	   system("pause");
	   return 0;
    }

 int * GetDate(int wk,int dy)
      {
            int calendar[5][7]=
            {
               {1,2,3,4,5,6,7},
               {8,9,10,11,12,13,14},
               {15,16,17,18,19,20,21},
               {22,23,24,25,26,27,28},
               {29,30,31,0,0,0,0}
            };
            return &calendar[wk][dy];
       }
*/
/*使用函数指针数组方式*/

/*typedef int (*funcptr) (int,int);
int add (int a,int b)
{
	return (a+b);
}
int sub (int a,int b)
{
	return (a-b);
}
int mul (int a,int b)
{
	return (a*b);
}
int main(void)
{
	int a=30,b=3;
	funcptr ptr[3];
	ptr[0]=add;
	printf("ptr[0](a,b)=%d\n",ptr[0](a,b));
	ptr[1]=sub;
	printf("ptr[1](a,b)=%d\n",ptr[1](a,b));
	ptr[2]=mul;
	printf("ptr[2](a,b)=%d\n",ptr[2](a,b));
	system("pause");
	return 0;
}
*/
/*使用宏定义的方式定义函数指针*/
/*
typedef int (*funcptr) (int,int);
int add (int a,int b)
{
	return (a+b);
}
int sub (int a,int b)
{
	return (a-b);
}
int mul (int a,int b)
{
	return (a*b);
}
int main(void)
{
	int a=20,b=3;
	funcptr ptr;
	ptr=add;
	printf("ptr(a,b)=%d\n",ptr(a,b));
	ptr=sub;
	printf("ptr(a,b)=%d\n",ptr(a,b));
	ptr=mul;
	printf("ptr(a,b)=%d\n",ptr(a,b));
	system("pause");
	return 0;
}*/
/*直接定义函数指针*/
/*
int add (int a,int b)
{
	return (a+b);
}
int sub (int a,int b)
{
	return (a-b);
}
int mul (int a,int b)
{
	return (a*b);
}
int main(void)
{
	int a=12,b=3;
	int (*ptr)(int,int);
	ptr=add;
	printf("ptr(a,b)=%d\n",ptr(a,b));
	ptr=sub;
	printf("ptr(a,b)=%d\n",ptr(a,b));
	ptr=mul;
	printf("ptr(a,b)=%d\n",ptr(a,b));
	system("pause");
	return 0;
}*/